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GForce Optitron Expansion for M-Tron Pro

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Quick Overview

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Key Features

30 New tape banks
5 Lead, 25 Rhythms all looped
4/4 Rhythms at 110 BPM
3/4 Rhythms at 80 BPM
35 Notes per tape bank
Over 150 New MTP Patches
OptiTron interface design


Backing Tracks & Effects

Banjo Singalong
Big Band
Big Top Marching Band
The Blues Sweet & Low
Bossa Nova Style
Cathedral Organ
Cha Cha Cha
Champagne Music
Classic Guitar
Dixieland Strut
Down Home
Easy Does it With Vibes
Folk & Other Moods
Gay 90s Waltz
Guitar in ¾
Latin Fever
Majestic Pipe Organ
Nashville Country
Polynesian Village
Pop Piano
Rollin Easy
Romantic Strings
Singing Rhythms
Sleigh Ride
Vox Humana

Lead Sounds

Harmonic Extra


If you looking for grungy lo-fi nostalgic grooves that radiate a classic feel and vibe of days gone by, look no further. That said, we’d also like to offer some friendly advice – If you want pristine, clean hi-fi rhythms look elsewhere.

Recorded from our own Optigan, the OptiTron Expansion Pack for M-Tron Pro offers 25 rhythms, a plethora of sound effects and a sprinkling of lead sounds from one of the world's most highly prized, kitsch, home entertainment instruments, the Optigan.

The Optigan was a Tron-like OPTIcal orGAN manufactured by toy giant Mattel® during the 1970s in an attempt to cash-in on the burgeoning home organ market. For various reasons it failed. But over the years it has become both a bona-fide collectors item for musicians as well as providing a source of inspiration for artists as diverse as Steve Hackett, Beck, Coil, Goldfrapp and Lily Allen. The main reason for this is the instantly nostalgic rhythms triggered via buttons to the left of the keyboard which, when combined with some pretty ordinary lead sounds played from the actual keyboard, emanates wonderful sounds from days gone by.

These lead and rhythm sounds came on a variety of flexible optical discs with styles ranging from the Glenn Miller style Big Band Beat to the wonderfully named Gay 90’s Waltz or Rollin Easy. All you had to do was insert the appropriate LP sized disc, fire up the machine and noodle away to your heart's content in the style of your choice.

On playback, the character and vibe of the instrument was so wonderful that all the foibles of this somewhat flawed instrument paled into insignificance as we began to use many of the sounds on personal projects to inject instant nostalgia and ghostly atmospheres.

In much the same way as with the all previous GForce instruments, we became excited at the thought of these sounds being made available to a new generation of users and the initial idea of creating an Optigan plug-in instrument surfaced. Development duly commenced. However, for a multitude of reasons this was never finished, not least of which was that during the early development stages we found that these grooves really felt at home when sitting alongside M-Tron sounds. Ultimately, we concluded that instead of an instrument in its own right, we would make these sounds available as an add-on pack for M-Tron Pro.

Consequently, all tempos had to be matched. Naturally, getting all the rhythms to adhere to a set tempo was a painstaking and very lengthy process. Nonetheless, on hearing the results of an early experiment where two different styles were layered and filtered within the M-TronPro we knew this was essential.

Over the course of many months, too many to contemplate, and with the help of a secret development copy of Izotope’s Radius, tempos for every rhythm were carefully tweaked until finally all 4/4 rhythms adhered to 110BPM and all 3/4 rhythms to 80 BPM.

The wonderful reward for this work is that it is now easy to mix and match any of the rhythms using the dual layer capability of M-Tron Pro, and via the tape reverse button, even have one rhythm reversed while an entirely different rhythm plays normally. With over twenty rhythms to chose from, the permutations here are literally endless and the creative potential for unique sounding mash-up grooves is truly inspiring.

We also decided that, unlike the Optigan rhythms that came with the M-Tron Pro library which strictly adhere to the notes and keys on the original instrument, we've filled in the gaps so you have a complete selection across all 35 notes. As such playing a D# Maj will trigger a pattern in the key of D# Maj.

Finally, while we did a certain amount of audio cleaning we duly acknowledge that some discs were in better condition than others. So it’s important to remember that a huge part of the appeal is in the very dusty and scratchy sounds that these 30+ year old vintage recordings emanate and we felt it was vital to retain this inherently enchanting and ethereal character and not be over-zealous in the clean-up process.

Accordingly, certain rhythms WILL BE WOBBLY, HISSY and SCRATCHY, and there will be pops and wonky loops across the library. Additionally, in some instances it isn’t a case of signal to noise ratio, more vice-versa. But this is all part of the original disc’s wear and tear and inherent spirit so we make no apologies for this.

What you have here is a goldmine of retro rhythms, sounds and effects – warts and all.

The OptiTron Expansion Pack is only available to registered users of M-Tron Pro. Additionally, it is exclusively available via this website as a direct download via "My Instruments" when the purchase has been completed.


Works With


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M-Tron Pro Expansion Packs are only available to registered users of M-Tron Pro. Additionally, they are exclusively available as direct downloads at

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The Original Instrument

While we love and admire the engineering of the original hardware machines, we also think hardware and good software should sit side-by-side. Because although the hardware versus software debate still rages, ad nauseam, the simple truth is that there's no definitive answer as to which is best. Just as there is good and bad hardware, there is good and bad software and the answer to this conundrum will depend on all manner of things including your personal perspective, available space, your technical savvy, your preferred working environment and of course your finances.

For example, do the majority of musicians looking for ‘that sound’ really care to maintain a forty-plus year old instrument, sourcing rare parts when they wear out or break?

Naturally we care, because we feel that we’re custodians of these instruments and while many other software companies simply hire-in instruments to record or model, we consider this bad practice. In our opinion good practice is when you've lived with and loved the original instrument's character and foibles for a considerable time before beginning any emulative process. Because, then and only then, do you stand a chance of capturing some of the instrument's soul and character within the software alchemy.

It's a simple dogma but you'd be surprised at how many software companies ignore this in favour of marketing hyperbole. Indeed, when we explained our philosophy to the marketing director of one such company, he said "No one really cares" and strolled off to no doubt perpetrate more marketing myths.

For us that fundamental understanding and love for an instrument is what really matters when trying to transplant its character. You see, we can tell the difference between good or bad, lazy or indifferent, marketing bullshit versus a real love for the authentic, because we’ve been immersed in these instruments for over 30 years. And in the case of Streetly, over 50 years!

But ponder this - while we’ve thrown countless bags of money at the purchasing and maintenance of all manner of tape replay instruments from Chamberlin’s to Mellotrons, we’re the exception. We’re committed (some would say ‘certifiable’) and we do it so that you don’t have to.

If you want an M400 plus all the tapes we supplied with the M-Tron Pro, you'd be looking at £20,000 plus, as opposed to the M-Tron Pro's £140. Likewise, if you wanted to buy the physical tape frames of a Streetly Tapes Volume for your original M400 you’d be looking at a price tag of at least £5,000, whereas at 1% of that each Streetly Tape Volume represent amazing value for money.

It’s something worth bearing in mind the next time that someone tells you that hardware is better than software.